What was found
SUPPLEMENTAL MRR: CREW REPORTED AT TOC AS THRUST WAS REDUCED, NR 2 ENG O/HEAT LIGHT ON OVERHEAD PANEL FLICKERED FOR 5 SECONDS AND WENT OUT. AT THE TOD DESCENT DURING THRUST REDUCTION, NR 2 ENG O/HEAT LIGHT CAME ON STEADY ILLUMINATING THE MASTER ENGINE O/HEAT LIGHT ON THE FWD PANEL. PER CHECK LIST, NR 2 ENGINE THROTTLE WAS CLOSED AND LIGHT WENT OUT. AFTER 3 MINUTES AT IDLE, ENG SHUT-DOWN CHECK LIST PERFORMED. EMERGENCY DECLARED. MAINTENANCE NOTIFIED. MAINTENANCE T/S SYS IAW MM 71-00-00 AND FOUND WIRE NR 9281-E9202-20 SHORTED TO GROUND ABOVE ENGINE MOUNT. REPAIRED WIRE INSULATION AND ISOLATED TO PREVENT FURTHER ABRASION. MX PERFORMED ENG O/HEAT SYS FUNCTIONAL TEST IAW AMM 75-41-00, NO DEFECTS NOTED.